>>Also, since Donut, the limit of enqueued tasks in AsyncTask is 128, not
20. So AsyncTask has a maximum of 10 threads running concurrently
so what is the solution for Android 1.5
--
Best Regards,
Atif Gulzar
I Unicode, ɹɐzlnƃ ɟıʇɐ
On Wed, Nov 11, 2009 at 9:25 PM, Romain Guy wrote:
> Please consider the implications of this: does it even make sense to
> have 20+ threads (on a single CPU device) updating the UI at once?
> That is NOT the purpose of AsyncTask. Also, since Donut, the limit of
> enqueued tasks in AsyncTask is 128, not 20. So AsyncTask has a maximum
> of 10 threads running concurrently and can hold up to 128 tasks
> waiting for a thread to be freed in the pool. So basically AsyncTask
> does exactly what you are trying to do here.
>
> On Wed, Nov 11, 2009 at 1:02 AM, Atif Gulzar
> wrote:
> > Android has a limit to rum at MAX 20 concurrent AsyncTask. To handle this
> > limit I created a AsyncTaskPool.java utility. Its not a pool in true
> sense
> > but a kind of scheduler. I am posting it here for your comments and it
> may
> > help others.
> >
> > import java.util.ArrayList;
> >
> > import android.os.AsyncTask;
> >
> > public class AsyncTaskPool
> > {
> >
> > private int poolSize;
> > private ArrayList currentTasks = new
> ArrayList();
> > private ArrayList pendingTasks = new ArrayList();
> >
> > /**
> > * @param poolSize
> > *: it should be less than 20. As Android only supports
> max.
> > 20 concurrent Asynch tasks.
> > */
> > public AsyncTaskPool(int poolSize)
> > {
> > this.poolSize = poolSize;
> > }
> >
> > public int getPoolSize()
> > {
> > return poolSize;
> > }
> >
> >
> > public boolean addTask(AsyncTask asyncTask, Object... params)
> > {
> >
> > if (currentTasks.size() < poolSize)
> > {
> > currentTasks.add(asyncTask);
> > if (params != null)
> > asyncTask.execute(params);
> > else
> > asyncTask.execute();
> > }
> > else
> > {
> > Object[] task = new Object[2];
> > task[0] = asyncTask;
> > task[1] = params;
> >
> > pendingTasks.add(task);
> > }
> >
> > return true;
> > }
> >
> > public boolean removeTask(AsyncTask task)
> > {
> > if(currentTasks.contains(task))
> > {
> > currentTasks.remove(task);
> > return true;
> > }
> > return false;
> > }
> >
> > //Add this method in the onPostExecute method of AsyncTask
> > public boolean removeAndExecuteNext(AsyncTask atask)
> > {
> > removeTask(atask);
> > if (pendingTasks.size()>0 && currentTasks.size() > {
> > Object [] task = (Object []) pendingTasks.get(0);
> > pendingTasks.remove(task);
> >
> > addTask((AsyncTask)task[0], (Object[])task[1]);
> >
> > }
> >
> > return false;
> > }
> >
> > }
> >
> >
> >
> > --
> > Best Regards,
> > Atif Gulzar
> >
> > I Unicode, ɹɐzlnƃ ɟıʇɐ
> >
> > --
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>
>
>
> --
> Romain Guy
> Android framework engineer
> romain...@android.com
>
> Note: please don't send private questions to me, as I don't have time
> to provide private support. All such questions should be posted on
> public forums, where I and others can see and answer them
>
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